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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ca88eb70fffa68fb4cc4ade3a74a9c0dba4790688a7596944e427c7699c2e2' 
  AND token = 'YqkVTjBf2BCNZguFym2ZtQT4Ulao5sXTDfaGUa7Pues=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}